Brushless help

Hey all,
I need some help with my brushless system. The problem is that the motor will not turn at all most of the time but randomly it does work when I start the system up, and when it does work it will sometimes work at near full power but other times it will have very little power.

The truck has been sitting around for a few months waiting for some parts but before I put it away it worked fine. The only thing I changed was I put a rc monster 2 speed adapter on.
I have the motor and esc from the fine design lst conversion kit and a max amps battery (BK Warrior 100amp 20 cell esc I think and the Fine Design equivalent to the feigao 9xl) . I have tried using a different battery but it still does not work and the drive terrain of the truck is free moving.

Thanks for the help.